Complications

Infection. People with structural heart problems, such as pulmonary stenosis, have a higher risk of developing bacterial infections in the inner lining of the heart (infectious endocarditis).

Heart-pumping problems. In severe pulmonary stenosis, the heart's right ventricle must pump harder to force blood into the pulmonary artery. Pumping of the right ventricle against increased pressure causes the muscular wall of the ventricle to thicken and the chamber within the ventricle to enlarge (right ventricular hypertrophy). Eventually, the heart becomes stiff and may weaken.

Heart failure. If the right ventricle is unable to pump efficiently, heart failure develops. This results in swelling of the legs and abdomen and can cause fatigue and shortness of breath.

Irregular heartbeat (arrhythmia). People with pulmonary stenosis are more likely to have an irregular heartbeat. Unless the stenosis is severe, irregular heartbeats associated with pulmonary stenosis usually aren't life-threatening.

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